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Provides a SAX-based API for validating XML documents using RELAX NG.

@see <a href="http://www.oasis-open.org/committees/relax-ng/spec.html">RELAX NG Specification</a>
@see <a href="http://www.oasis-open.org/committees/relax-ng/tutorial.html">RELAX NG Tutorial</a>
@see <a href="http://www.oasis-open.org/committees/relax-ng/compatibility.html">RELAX NG DTD Compatibility</a>
@see <a href="http://www.saxproject.org">SAX</a>
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